Radiocarbon dating after 1950

This discovery meant that there are three naturally occurring isotopes of carbon: Whereas carbon-12 and carbon-13 are stable isotopes, carbon-14 is unstable or radioactive.

Carbon-14 is produced in the upper atmosphere when cosmic rays bombard nitrogen atoms.

Plants absorb both kinds, in the form of carbon dioxide, from the atmosphere.

Libby, a Professor of Chemistry at the University of Chicago, predicted that a radioactive isotope of carbon, known as carbon-14, would be found to occur in nature.Radiocarbon dating can be a useful tool in police investigations when combined with other forensic information.The technique relies on a simple natural phenomenon: living organisms contain both stable forms of the element carbon and a radioactive form, called carbon-14 (C14).Around the world, forgers have become adept at faking modern carvings to make them look old.Conservationists argued that sales on auction sites like e Bay created a market that encouraged the forgers - and the poachers who kill elephants to meet the demand.

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